I've got injuries in my lower body that would probably prevent squat type stuff (although I can rep pistol squats) but my training is 50% cardio 50% calisthenics. I do a lot of barefoot running, normally 5-15k at a time. My weeks look like calisthenics push day, barefoot running day, calisthenics pull day, rest day, repeat. I don't want huge quads but I do want big, ripped calves & barefoot running will give you that, especially on hills. But yes, many calisthenics people have chicken legs. No, I don't really want to be that big personally. Weight lifting/commercial gyms & the culture that surrounds it is also a big turnoff for me.
Gymnastics Bodies forum is a good source, but Coach Sommers is not without controversy but I don't know enough about him to comment, but have heard many complaints. I don't think RR goes as far as a planche but I got mine through the million different progressions I learned on youtube vids, it's probably at least 50 or 60 different excersizes.
In the West, the gymnastics world is very closed off, it's 95% rich people (just to train gymnastics requires a massive warehouse w/tons of equipment, it's a 200-300K investment up front) & most gymnasts come from family lines, their fathers/grandfathers/etc were gymnasts & they understand they'll waste their entire youth on training & then get set up with a cushy/easy jobs coaching rich kids in the suburbs once they burn out at 25 or 30. So in the US, gymnastics is fairly elite stuff but in Ukraine or Russia, the Soviets had systems setup so that everyone could train gymnastics & that legacy continues to today. In Kiev & Moscow I met many people who could planche. I said that to say yes, planche is a tough move, but given enough training most males are capable of achieving it, regardless of genetics. And thats where modern western calisthenics/street workout comes from, people who want to train gymnastics but can't afford it.